Read the following SAT test question and then click on a button to select your answer.

In the figure above, x = 60 and y = 40. If the dashed lines bisect the angles with measures of x degrees and y degrees, what is the value of z?

(A) 25
(B) 35
(C) 40
(D) 45
(E) 50

来源:可可英语 http://www.kekenet.com/sat/201409/325135.shtml